This is a typical issue (it's probably faq somewhere), and is one of missing dependencies. Add

END {
    my @pp = 'pp', '-n';
    foreach(keys %INC){
        s[/][::]g;
        s/\.pm$//;
        push @pp, '-M', $_;
    }
    push @pp, __FILE__;
    print "@pp $/";
}
[download]

and run the resulting command. For me that was

pp -M Crypt::OpenPGP::Plaintext -M Carp -M Crypt::OpenPGP::Buffer -M C
+rypt::Random::Generator -M lib -M Crypt::OpenPGP::Util -M IO::Socket:
+:UNIX -M Crypt::OpenPGP::Signature::SubPacket -M Crypt::OpenPGP::Key:
+:Public::DSA -M constant -M Convert::ASCII::Armour -M IO::Socket::INE
+T -M Crypt::DES -M strict -M Crypt::OpenPGP::Key -M vars -M base -M C
+onfig -M Crypt::RSA::DataFormat -M Crypt::CBC -M Digest::SHA1 -M Cryp
+t::Random::Provider::devurandom -M Crypt::RSA::Key::Public -M Data::D
+umper -M Crypt::OpenPGP::Certificate -M Crypt::OpenPGP::Key::Public -
+M Crypt::RSA -M Crypt::OpenPGP::Key::Public::RSA -M Crypt::DSA::Key -
+M MIME::Base64 -M Symbol -M Exporter::Heavy -M Crypt::OpenPGP::Signat
+ure -M bytes -M C:::Perl::site::lib::auto::Compress::Zlib::autosplit.
+ix -M Crypt::OpenPGP::Ciphertext -M Crypt::OpenPGP::PacketFactory -M 
+Crypt::RSA::Errorhandler -M Crypt::Random::Provider::egd -M IO::Handl
+e -M Crypt::OpenPGP::Key::Secret -M Crypt::OpenPGP -M Crypt::OpenPGP:
+:ErrorHandler -M Crypt::OpenPGP::Config -M Math::Pari -M Crypt::OpenP
+GP::Key::Public::ElGamal -M Crypt::OpenPGP::KeyRing -M Exporter -M IO
+::Socket -M Errno -M Crypt::OpenPGP::Digest -M subs -M DynaLoader -M 
+File::Spec::Unix -M Crypt::Random -M Crypt::Random::Provider::rand -M
+ Crypt::RSA::Key::Private -M SelectSaver -M Crypt::OpenPGP::S2k -M IO
+ -M Crypt::OpenPGP::Message -M File::Spec::Win32 -M Class::Loader -M 
+Socket -M Crypt::OpenPGP::KeyBlock -M Crypt::OpenPGP::SessionKey -M C
+rypt::OpenPGP::Armour -M integer -M Compress::Zlib -M XSLoader -M Dig
+est::MD5 -M Crypt::DES_EDE3 -M Crypt::OpenPGP::CFB -M Crypt::OpenPGP:
+:Constants -M Tie::EncryptedHash -M File::Spec -M Crypt::RSA::Key -M 
+warnings::register -M warnings -M Crypt::Primes -M Crypt::OpenPGP::Us
+erID -M overload -M Crypt::DSA::Util -M Crypt::OpenPGP::Cipher -M Aut
+oLoader -M Crypt::Random::Provider::File -M Data::Buffer  test.pl
[download]

The resulting file was 2.09 MB (2,198,289 bytes) in size.

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